CN110071739B - Communication system and method based on frequency hopping, GMSK and DS - Google Patents
Communication system and method based on frequency hopping, GMSK and DS Download PDFInfo
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- CN110071739B CN110071739B CN201910181068.7A CN201910181068A CN110071739B CN 110071739 B CN110071739 B CN 110071739B CN 201910181068 A CN201910181068 A CN 201910181068A CN 110071739 B CN110071739 B CN 110071739B
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- 230000008054 signal transmission Effects 0.000 abstract description 7
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/106—M-ary FSK
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Abstract
The invention provides a communication system and a method based on frequency hopping, GMSK and DS.A signal transmitting module acquires information data, carries out RS coding, DS direct sequence spread and GMSK modulation processing on the information data, and then carries out frequency mixing and frequency hopping processing and then transmits the information data; the signal receiving module receives the information data transmitted by the signal transmitting module, carries out frequency hopping and mixing processing, then carries out capturing, judging, decoding and framing processing, and finally outputs the information data. By adopting RS coding, DS direct expansion, GMSK modulation and frequency mixing and frequency hopping processing, the invention can greatly improve the anti-interference capability and ensure the safe and accurate transmission of signals.
Description
Technical Field
The invention belongs to the field of communication, and particularly relates to a communication system and method based on frequency hopping, GMSK and DS.
Background
In a data transmission system which is commonly used in the market at present, data transmission is carried out by using a fixed frequency band, for example, all current general consumer-grade unmanned aerial vehicles use a fixed 2.4G frequency band; in a space environment, signal interference of various different frequency bands exists, so that if signals of the same frequency band occur in data communication, equipment is easily interfered, data transmission errors or communication distances are reduced, control failure of the equipment can be caused when the interference is strong, the equipment is damaged, and danger can be caused to personal safety under severe conditions.
Therefore, in information transmission, severe requirements are put on the anti-interference performance, safety and stability of communication, which becomes an important problem in current wireless communication devices.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a communication system and a communication method based on frequency hopping, GMSK and DS, which have stronger anti-jamming capability.
The invention is realized by the following technical scheme:
a communication system based on frequency hopping, GMSK and DS comprises a signal transmitting module and a signal receiving module;
the signal transmitting module includes:
the data acquisition module is used for acquiring information data and sending the information data to the transmitting terminal data processing module;
the transmitting terminal data processing module is used for carrying out RS coding, DS direct expansion and GMSK modulation processing on the received information data, and the processed information data is sent to the radio frequency transmitting module;
the radio frequency transmitting module is used for carrying out frequency mixing and frequency hopping processing on the received information data, and the processed data are transmitted through a transmitting antenna;
the signal receiving module includes:
the radio frequency receiving module is used for receiving the information data transmitted by the radio frequency transmitting module through the receiving antenna, carrying out frequency hopping and frequency mixing processing, and transmitting the processed information data to the receiving end data processing module;
the receiving end data processing module is used for capturing, judging, RS decoding and framing the received information data, and the processed information data is sent to the data output module;
and the data output module is used for outputting the information data.
Preferably, the transmitting terminal data processing module adopts a first FPGA chip, and the radio frequency transmitting module adopts a first AD9361 chip; the receiving end data processing module adopts a second FPGA chip, and the radio frequency receiving module adopts a second AD9361 chip.
Further, the signal transmitting module further comprises: a first clock circuit, a first power supply circuit, and a first storage circuit; the first clock circuit provides clocks for the first FPGA chip and the first AD9361 chip; the first power supply circuit provides power supply voltage for the signal transmitting module; the first storage circuit stores the curing code of the first FPGA chip.
Further, the signal receiving module further includes: the second clock circuit, the second power supply circuit and the second storage circuit; the second clock circuit provides clocks for the second FPGA chip and the second AD9361 chip; the second power supply circuit provides power supply voltage for the signal receiving module; and the second storage circuit stores the curing code of the second FPGA chip.
Preferably, the data acquisition module adopts an RS232 interface.
Preferably, the data output module adopts an RS422 interface.
A communication method based on frequency hopping, GMSK and DS is based on the system, which includes: the signal transmitting module collects information data, carries out RS coding, DS direct sequence spread spectrum and GMSK modulation processing on the information data, and then carries out frequency mixing and frequency hopping processing and then transmits the information data; the signal receiving module receives the information data transmitted by the signal transmitting module, carries out frequency hopping and mixing processing, then carries out capturing, judging, decoding and framing processing, and finally outputs the information data.
Preferably, the frequency hopping frequency is 1000 Hop.
Compared with the prior art, the invention has the following beneficial technical effects:
the communication system of the invention adopts RS coding + DS direct amplification + GMSK modulation, and can greatly improve the anti-interference capability of the equipment through channel coding + GMSK modulation. The RS codes can resist random errors occurring in the signal transmission process, RS (63,51) codes are used in communication, and according to the error correction capability of the RS codes, when error bits of a group of data are less than 6, the RS codes can correctly recover the original data; the DS direct frequency can expand the frequency band of the signal, so that the signal power is averaged to a broadband range, and data can be captured under the condition of low signal-to-noise ratio; GMSK modulation is to pre-modulate and filter a Gauss filter based on MSK modulation, and the modulation phase is continuous and smooth transition, so the GMSK modulation frequency deviation is compact, the error rate is low, and the communication error code situation can be reduced. The frequency hopping processing has larger hopping capacity for the interference of fixed frequency, and can accurately resolve the corresponding instruction in repeated instruction transmission for a plurality of times. The invention provides a data communication system with stronger interference resistance, which can realize stable, safe and reliable communication among devices within the range of 20 kilometers.
Furthermore, the communication system of the invention adopts an FPGA + AD9361 framework on hardware, configures the AD9361 through flexible sequential logic of the FPGA, and compresses the carrier locking time of the AD9361 to 40 mus under the condition of using the local oscillator in the AD 9361. In a communication system, the locking time of 40 mu s can enable the frequency hopping frequency to reach 1000Hop, the frequency switching is completed for 1000 times in 1s, the large hopping capability is realized for the interference of fixed frequency, and the corresponding command can be accurately analyzed in the repeated command transmission for a plurality of times.
The communication method of the invention adopts RS coding, DS direct sequence spread, GMSK modulation and frequency mixing and frequency hopping processing, thereby greatly improving the anti-interference capability and ensuring the safe and accurate transmission of signals.
Drawings
FIG. 1 is a functional block diagram of a communication system according to the present invention, (a) a functional block diagram of a signal transmitting module, and (b) a functional block diagram of a signal receiving module;
FIG. 2 is a hardware block diagram of a communication system according to the present invention, wherein (a) the hardware block diagram of the signal transmitting module and (b) the hardware block diagram of the signal receiving module;
fig. 3 is a flow chart of a communication method of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The communication system comprises a signal transmitting module and a signal receiving module, wherein the signal transmitting module and the signal receiving module are communicated through a space radio signal, and the signal transmitting module mainly completes the functions of external data acquisition, channel coding, spread spectrum, GMSK modulation and frequency mixing and frequency hopping; the signal receiving module mainly completes the functions of frequency mixing and hopping, capturing, judging, RS decoding, framing and external data interaction of signals. The interrelationship between the modules is shown in fig. 1. The details are as follows.
The signal transmitting module includes:
the data acquisition module is used for acquiring information data and sending the information data to the transmitting terminal data processing module;
the transmitting terminal data processing module is used for carrying out RS coding, DS direct expansion and GMSK modulation processing on the received information data, and the processed information data is sent to the radio frequency transmitting module;
and the radio frequency transmitting module is used for carrying out frequency mixing and frequency hopping processing on the received information data, and transmitting the processed data through a transmitting antenna.
The data acquisition module adopts an RS232 interface which is a universal interface and can be compatible with each platform for use; the channel coding can resist random errors occurring in the signal transmission process, RS (63,31) coding is used in communication, and according to the error correction capability of the RS coding, when error bits of a group of data are less than 6, the RS coding can correctly recover the original data; DS direct spread can expand the frequency band of the signal, make the signal power average to a broadband scope, can catch the data under the condition of low signal-to-noise ratio, use two groups of cross-correlation as zero, the pseudo-random code that the autocorrelation stands out is regarded as the spread spectrum sequence, the length of this sequence is 128 bits; GMSK modulation is to pre-modulate and filter a Gauss filter on the basis of MSK modulation, and the modulation phase is continuous and smooth, so that GMSK modulation frequency deviation is compact, the error rate is low, and the communication error code situation can be reduced; the frequency mixing and hopping is to directly mix the zero-frequency signal of the baseband into a radio-frequency signal and simultaneously use different frequency mixing local oscillators to complete the frequency hopping function.
The signal receiving module includes:
the radio frequency receiving module is used for receiving the information data transmitted by the radio frequency transmitting module through the receiving antenna, carrying out frequency hopping and frequency mixing processing, and transmitting the processed information data to the receiving end data processing module;
the receiving end data processing module is used for capturing, judging, RS decoding and framing the received information data, and the processed information data is sent to the data output module;
and the data output module is used for outputting the information data.
The frequency mixing is to mix the radio frequency signal to a baseband signal, and simultaneously use different frequency mixing local oscillators to complete the frequency hopping following function; the capture is that two groups of pseudo-random sequences which are the same as the spread spectrum codes are respectively correlated, the length of the sequences is 128 bits, and correlation values of the two groups of spread spectrum sequences are respectively obtained; judging whether the peak values of the two groups of correlation values are obtained according to the two groups of captured correlation values to obtain original 0 and 1 code streams; RS decoding is to obtain an original code stream by decoding according to a coding (63,31) formula; framing is to extract the data stream obtained by decoding according to a protocol and extract effective data; the data output module uses RS422 interface, and can extract the transmitted required data stream according to the protocol.
The hardware block diagram of each module is shown in fig. 2, and is specifically introduced as follows.
The signal transmitting module hardware comprises a first FPGA chip, a first AD9361 chip, a first clock circuit, a first power supply circuit, a first interface circuit and a first storage circuit; the first FPGA chip mainly completes the functions of original data protocol processing, RS encoding, DS direct expansion, GMSK modulation and AD9361 configuration; the first AD9361 chip mainly completes a frequency mixing function from zero frequency to radio frequency and a frequency hopping function; the first clock circuit mainly provides clocks for the first FPGA chip and the first AD9361 chip; the first power supply circuit is used for providing different power supply voltages for the signal transmitting module; the first interface circuit is used for collecting external data; the first storage circuit is used for storing the curing codes of the first FPGA chip, and the FPGA curing codes are output by the storage circuit when the FPGA chip is started.
The signal receiving module hardware comprises a second FPGA chip, a second AD9361 chip, a second clock circuit, a second power supply circuit, a second interface circuit and a second storage circuit; the second FPGA chip mainly completes capture, judgment, decoding and framing of baseband signals, interface protocol processing and second AD9361 configuration functions; the second AD9361 chip mainly completes the frequency mixing function from radio frequency to zero frequency and the frequency hopping function; the second clock circuit mainly provides clocks for the second FPGA chip and the second AD9361 chip; the second power supply circuit is used for providing different power supply voltages for the signal receiving module; the second interface circuit is used for the external data interaction function; the second storage circuit is used for storing the curing codes of the second FPGA chip, and the FPGA curing codes are output by the storage circuit when the second storage circuit is started.
The signal transmission of the system of the invention comprises 7 parts, including: acquiring an original data stream by a signal transmitting module; the signal transmitting module performs software radio processing on the original data stream, namely RS encoding, DS direct amplification and GMSK modulation; the signal transmitting module carries out space radiation after frequency mixing and frequency hopping; signal transmission in a spatial channel; the signal receiving module receives signals in space and performs frequency hopping and mixing; the signal receiving module captures, judges, decodes and unframes data; and the receiving module and the external interface carry out data interactive output. The data transmission flow chart is shown in fig. 3.
The invention has the following advantages:
1) an FPGA + AD9361 framework is adopted on hardware, the AD9361 is configured through flexible sequential logic of the FPGA, and the carrier locking time of the AD9361 is compressed to 40 mus under the condition of using a local oscillator in the AD 9361. In a communication system, the locking time of 40 mu s can enable the frequency hopping frequency to reach 1000Hop, the frequency switching is completed for 1000 times in 1s, the large hopping capability is realized for the interference of fixed frequency, and the corresponding command can be accurately analyzed in the repeated command transmission for a plurality of times.
2) RS coding + DS direct amplification + GMSK modulation is adopted in software, and the anti-interference capability of the equipment can be greatly improved through channel coding + GMSK modulation. The RS codes can resist random errors occurring in the signal transmission process, RS (63,51) codes are used in communication, and according to the error correction capability of the RS codes, when error bits of a group of data are less than 6, the RS codes can correctly recover the original data; the DS direct frequency can expand the frequency band of the signal, so that the signal power is averaged to a broadband range, data can be captured under the condition of low signal-to-noise ratio, and the spread spectrum pseudo-random code length is 128 bits; GMSK modulation is to pre-modulate and filter a Gauss filter based on MSK modulation, and the modulation phase is continuous and smooth transition, so the GMSK modulation frequency deviation is compact, the error rate is low, and the communication error code situation can be reduced.
The invention has stronger signal processing capability, is suitable for various channel environments and can be determined according to actual conditions.
Claims (4)
1. A communication system based on frequency hopping, GMSK and DS is characterized in that the communication system comprises a signal transmitting module and a signal receiving module;
the signal transmitting module includes:
the data acquisition module is used for acquiring information data and sending the information data to the transmitting terminal data processing module;
the transmitting terminal data processing module is used for carrying out RS coding, DS direct expansion and GMSK modulation processing on the received information data, and the processed information data is sent to the radio frequency transmitting module;
the radio frequency transmitting module is used for carrying out frequency mixing and frequency hopping processing on the received information data, and the processed data are transmitted through a transmitting antenna;
the signal receiving module includes:
the radio frequency receiving module is used for receiving the information data transmitted by the radio frequency transmitting module through the receiving antenna, carrying out frequency hopping and frequency mixing processing, and transmitting the processed information data to the receiving end data processing module;
the receiving end data processing module is used for capturing, judging, RS decoding and framing the received information data, and the processed information data is sent to the data output module;
the data output module is used for outputting the information data;
the transmitting terminal data processing module adopts a first FPGA chip, and the radio frequency transmitting module adopts a first AD9361 chip; the receiving end data processing module adopts a second FPGA chip, and the radio frequency receiving module adopts a second AD9361 chip;
the signal transmitting module further comprises: a first clock circuit, a first power supply circuit, and a first storage circuit; the first clock circuit provides clocks for the first FPGA chip and the first AD9361 chip; the first power supply circuit provides power supply voltage for the signal transmitting module; the first storage circuit stores the curing codes of the first FPGA chip;
the signal receiving module further includes: the second clock circuit, the second power supply circuit and the second storage circuit; the second clock circuit provides clocks for the second FPGA chip and the second AD9361 chip; the second power supply circuit provides power supply voltage for the signal receiving module; and the second storage circuit stores the curing code of the second FPGA chip.
2. The frequency hopping, GMSK and DS based communication system according to claim 1 wherein the data acquisition module employs an RS232 interface.
3. The frequency hopping, GMSK and DS based communication system according to claim 1, wherein the data output module employs an RS422 interface.
4. A method of communication based on frequency hopping, GMSK and DS, characterized in that the system according to any one of claims 1 to 3 comprises: the signal transmitting module collects information data, carries out RS coding, DS direct sequence spread spectrum and GMSK modulation processing on the information data, and then carries out frequency mixing and frequency hopping processing and then transmits the information data; the signal receiving module receives the information data transmitted by the signal transmitting module, performs frequency hopping and mixing processing, then performs capturing, judging, decoding and framing processing, and finally outputs the information data; the frequency hopping rate is 1000 hops/second.
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| CN111510410B (en) * | 2020-01-02 | 2021-03-26 | 北京理工大学 | Anti-interference DS-GMSK receiving method and device suitable for satellite communication |
| CN113671931B (en) * | 2021-07-28 | 2022-10-18 | 通号城市轨道交通技术有限公司 | Safety signal collector |
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| CN104393891A (en) * | 2014-11-27 | 2015-03-04 | 电子科技大学 | Communication method for driving frequency spreading/frequency hopping of direct sequence by adopting information |
| CN107395218A (en) * | 2017-07-10 | 2017-11-24 | 西安电子科技大学 | R-T unit and design method based on FPGA and radio frequency agile transceiver |
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Denomination of invention: A communication system and method based on frequency hopping, GMSK, and DS Effective date of registration: 20231016 Granted publication date: 20210914 Pledgee: Industrial Bank Limited by Share Ltd. Xi'an branch Pledgor: XI'AN STANDARD INFORMATION TECHNOLOGY Co.,Ltd. Registration number: Y2023610000702 |
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